Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3aa87933c14f66…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 21:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c45e475f562605c2dbfb8694aa400815 SHA-1: ac7c23116c34c0245d0bf2c62b2d66f0a529c7a7 SHA-256: 6d3aa87933c14f66d254197ea6071b7f547bf33fc71f7391e4fa5fbbfa8ef9ba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lead users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=craftsman+6+1%252F8+jointer+planer+motor PDF link annotation
    • http://dujekuba.22web.org/32369325206.pdfIn PDF document text
    • https://faxomozux.weebly.com/uploads/1/3/0/7/130775398/327d76697c22dd8.pdfIn PDF document text
    • http://vexawenebo.22web.org/samsung_un32eh5300fxza_specs.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/gomuwaramexi-nerigoferewuk-durevazaw-vizaxunu.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/ladezewisusim_juratekik_busume_xepelimamujifag.pdfIn PDF document text
    • https://suwiguvona.weebly.com/uploads/1/3/1/3/131398052/72c3b257efeaade.pdfIn PDF document text
    • http://desenusexewu.iblogger.org/facebook.com_account_settings.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/order_additional_ielts_score_report.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/wubavum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/919ff82e-373d-4b8b-8aa3-3b5d5a1d1e96/tupite.pdfIn PDF document text
    • http://fekugijofexoz.epizy.com/wing_chun_1994_watch_online.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_6f34755ebd644bff8b2b3c6db94538fa.pdf?index=trueIn PDF document text
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_014cdb36a8854413ae24a39495ffb318.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f30d6e068dc64ba4b831f06990de1c0e.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_0788019877ae4d1c9f34fcb0c2753d6a.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_8afebcce700148c9b4ba1b36f19be1cf.pdf?index=trueIn PDF document text
    • http://topufopotu.epizy.com/64049245575.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/xaxojabevajuwabafi.pdfIn PDF document text
    • http://lojawesepex.rf.gd/boot_camp_6_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cba4b7-8028-4e8b-8c37-481c813723c7/icom_706_mk2_mods.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/goxepipifofajaripeveza.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_d92f2646fcf940d084ac8ec82223936c.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_c98add905c894954991e1cdedd26ce5c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 5464 bytes
SHA-256: 0ca80afa55214da7a414187eba576b849a97db3a361dae3c863d686f652436a8
font_01_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 10724 bytes
SHA-256: 5fdf76e2f5052621644a8380a5803a671928340e03af67c37a66175a326dc002